cypress公司的CY29430是可编PLL晶体振荡器解决方案,输出频率可在15MHz和2.1GHz间灵活选择,工作电压1.8V-3.3V,工作温度C40 °C到105 °C,主要用在通信领域如OTN, SONET/SDH, xDSL, GbE,网络,无线基础设备以及测试测量,高速数据转换.本文介绍了CY29430主要特性, 逻辑框图以及评估板CY3677主要特性,框图,电路图与材料清单.

The CY29430 is a Programmable PLL based crystal oscillator solution with flexible output frequency options. It is field and factory programmable for any output frequency between 15 MHz and 2.1 GHz. Four frequencies are independently programmable on the differential output with the frequency select (FS) pins.

Additionally, other frequency options can be configured with the I2C interface. Using advanced design technology, it provides excellent jitter performance across the entire output frequency range working reliably at supply voltages from 1.8 V to 3.3 V for ambient temperatures from C40 °C to +105 °C. This makes it ideally suited for communications applications (for example, OTN, SONET/SDH, xDSL, GbE, Networking, Wireless Infrastructure), test and instrumentation applications, and high speed data converters. Additionally, the VCXO function enables the use of CY29430 in applications requiring a clock source with voltage control and in discrete clocking solutions for synchronous timing applications.

CY29430主要特性:

■ Low-noise PLL for high-performance clock applications
■ Differential Clock Output: Four frequencies selectable, reconfigurable by I2C
■ Output frequency support from 15 MHz to 2.1 GHz
■ Fractional N PLL with fully integrated VCO
■ Works on third overtone (OT3) of a fixed frequency crystal, Low frequency fundamental (LFF), High frequency fundamental (HFF) mode crystal and Low Frequency Input
■ LVPECL, CML, HCSL, LVDS or LVCMOS output standards available
■ Compatible with 3.3 V, 2.5 V, and 1.8V supply
■ 150 fs typical integrated jitter performance (12 kHz to 20 MHz frequency offsets) for output greater than 150 MHz
■ VCXO functionality provided with tunable Total Pull Range (TPR) from +/- 50 ppm to +/- 275 ppm
■ 16 pin QFN package: 3 × 3 × 0.6 mm

图1. CY29430逻辑框图

评估板CY3677

Thank you for your interest in the CY3677 Evaluation Kit (EVK). The CY3677 EVK is designed to enable you to evaluate the programmable clock device CY29430, the latest addition to the Cypress timing product portfolio. The clock device CY29430 is a high-performance programmable oscillator with one fractional PLL that generates any frequency up to 2.1 GHz with jitter as low as 110 fs. The device offers one differential output and one single-ended output. The device can be configured to generate either a single-ended output or a differential output but not both simultaneously. The device comes in a 16-pin QFN package for industrial applications. The differential I/O standards supported are LVDS, LVPECL, High-Speed Current Steering Logic (HCSL), and Current Mode Logic (CML). The single-ended signal supported is LVCMOS. The device also supports features such as a Voltage-Controlled Crystal Oscillator (VCXO), and provides the user with an I2C programming interface. The device supports four frequency profiles, which can be switched dynamically using external Frequency Select (FS0 and FS1) signals. There are two jumpers provided on the EVK to perform frequency selection on the board.

The CY3677 EVK allows you to evaluate output clock signals by making required on-board termination settings.
The CY3677 EVK includes the following:
・ CY3677 Evaluation Board
・ USB Standard-A to Mini-B cable
・ Quick Start Guide

图2. 评估板CY3677外形图:左:正面;右:背面

图3. 评估板CY3677框图

图4. 评估板CY3677电路图(1):电源和LED指示器

图5. 评估板CY3677电路图(2):控制器

图6. 评估板CY3677电路图(3):CY29430

评估板CY3677材料清单:




图7. 评估板CY3677 PCB制造图
详情请见:
http://www.cypress.com/file/280106/download
和
http://www.cypress.com/file/296416/download